// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2015 Vijay Vasudevan <vrv@google.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#define EIGEN_USE_THREADS

#include <atomic>

#include "main.h"
#include <Eigen/CXX11/Tensor>
#include <stdlib.h>

static void
test_notification_single()
{
	ThreadPool thread_pool(1);

	std::atomic<int> counter(0);
	Eigen::Notification n;
	auto func = [&n, &counter]() {
		n.Wait();
		++counter;
	};
	thread_pool.Schedule(func);
	std::this_thread::sleep_for(std::chrono::milliseconds(1000));

	// The thread should be waiting for the notification.
	VERIFY_IS_EQUAL(counter, 0);

	// Unblock the thread
	n.Notify();

	std::this_thread::sleep_for(std::chrono::milliseconds(1000));

	// Verify the counter has been incremented
	VERIFY_IS_EQUAL(counter, 1);
}

// Like test_notification_single() but enqueues multiple threads to
// validate that all threads get notified by Notify().
static void
test_notification_multiple()
{
	ThreadPool thread_pool(1);

	std::atomic<int> counter(0);
	Eigen::Notification n;
	auto func = [&n, &counter]() {
		n.Wait();
		++counter;
	};
	thread_pool.Schedule(func);
	thread_pool.Schedule(func);
	thread_pool.Schedule(func);
	thread_pool.Schedule(func);
	std::this_thread::sleep_for(std::chrono::milliseconds(1000));
	VERIFY_IS_EQUAL(counter, 0);
	n.Notify();
	std::this_thread::sleep_for(std::chrono::milliseconds(1000));
	VERIFY_IS_EQUAL(counter, 4);
}

EIGEN_DECLARE_TEST(cxx11_tensor_notification)
{
	CALL_SUBTEST(test_notification_single());
	CALL_SUBTEST(test_notification_multiple());
}
